This paper introduces a new layer in the low-power wireless stack: the announcement layer. The announcement layer coordinates and piggybacks beacon broadcasts to reduce both energy consumption and radio congestion. The code is intended to be included in Contiki after the 2.5 release. The paper also presents the first performance results of the ContikiMAC radio duty cycling mechanism. PowerPoint slides are also available.

This paper looks at low-power IPv6 interoperability from a performance perspective. We run Contiki and TinyOS, both running IPv6 with RPL routing, in the Contiki simulation environment and find that although both systems have a good performance on their own, the performance in a combined network can be surprisingly low.

This paper studies how the protocols in the low-power IPv6 stack behave during network deployment. In particular, the paper looks at software deployment and demonstrates that a simple mechanism in the ContikiMAC low-power radio mechanism is able to significantly improve throughput with a retained low power consumption.

This paper argues that the traditional broadcast primitive sometimes is overkill in low-power wireless networks and argues that there is a need for a new communication primitive, called politecast. A politecast transmission reaches only those neighbors that explicitly listen for it. Politecast transmissions are intended for periodic, but redundant, beacon transmissions.